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AR# 34707

Description

On page 7 of the customization GUI, the value for TXPREEMPHASIS cannot be changed from the default value of 52.

Solution

If you would like to change the value from other than 52, then in thesource directory of your generated core open the file with the same name as the generated core (as entered in CORE Generator). Around line 163, look for the parameter:

parameter TXPREEMPHASIS = 3'b111,

Use the Virtex-5 FPGA RocketIO User Guides, UG196 (for LXT) and UG198 (for FXT) to select the appropriate values for TXPREMPHASIS. For UG196, using v2.1 of the document dated December 3, 2009, this information is on page 128. For UG198, using v3.0 dated October 30, 2009, this information is on page 152.